Mysql查询从3张表中获取信息

Question

我有以下 3 个表，我需要从中获取信息。 nagios_性能_数据 nagios_large_performance_data 客户端电路映射

下面是这些表中的示例数据，

nagios_performance_data
 circuit_name               | record_date         | latency | packetloss |
+----------------------------+---------------------+---------+------------+
| Device 1                  | 2016-11-28 04:40:00 |   72.54 |       0.00

nagios_large_performance_data
+----------------------------+---------------------+---------+------------+
| circuit_name               | record_date         | latency | packetloss |
+----------------------------+---------------------+---------+------------+
| Device 1                   | 0000-00-00 00:00:00 |   83.00 |       0.00 |
+----------------------------+---------------------+---------+------------+

client_circuit_mapping
+-------------------------------+---------------------------------------+
| circuit_name                  | groupname                             |
+-------------------------------+---------------------------------------+
| Device1                       |Group1                                 |
+-------------------------------+---------------------------------------+

现在我需要查询这三个表以获得以下输出，

client_circle_mapping.groupname、nagios_performance_data.Circuit_name、nagios_performance_data.record_date、nagios_performance_data.packetloss、nagios_performance_data.latency、nagios_large_performance_data.latency

任何人都可以帮我查询以获得此输出

Answer 1

只需使用电路名称连接这三个表即可:

select 
    c.groupname,
    a.circuit_name,
    a.record_date,
    a.packetloss,
    a.latency,
    b.latency
from nagios_performance_data a
join nagios_large_performance_data b on a.circuit_name = b.circuit_name
join client_circuit_mapping on a.circuit_name = c.circuit_name